<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0;
      width: 100%;
      height: 100%;
      background: url('https://www.zhku.edu.cn/images/pic14.jpg') no-repeat center;
    }

  </style>
</head>

<body>
  
</body>

</html>